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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LAN8741Ai-EN датащи(PDF) 95 Page - Microchip Technology |
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LAN8741Ai-EN датащи(HTML) 95 Page - Microchip Technology |
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95 / 106 page  2013-2015 Microchip Technology Inc. DS00001988A-page 95 LAN8741A/LAN8741Ai 3: The total deviation for the Transmitter Clock Frequency is specified by IEEE 802.3u as ±50 ppm. 4: 0°C for commercial version, -40°C for industrial version 5: +70°C for commercial version, +85°C for industrial version 6: This number includes the pad, the bond wire and the lead frame. PCB capacitance is not included in this value. The XTAL1/CLKIN pin, XTAL2 pin and PCB capacitance values are required to accurately calculate the value of the two external load capacitors. These two external load capacitors determine the accuracy of the 25.000 MHz frequency. 5.7.2 100 µW 25 MHZ CRYSTAL SPECIFICATIONS When utilizing a 100 µW 25 MHz crystal, the following circuit design (Figure 5-9) and specifications (Table 5-16) are required to ensure proper operation. FIGURE 5-9: 100 µW 25 MHZ CRYSTAL CIRCUIT TABLE 5-16: 100 µW CRYSTAL SPECIFICATIONS Parameter Symbol Min. Nom. Max. Unit Note Crystal Cut AT, typ Crystal Oscillation Mode Fundamental Mode Crystal Calibration Mode Parallel Resonant Mode Frequency Ffund - 25.000 - MHz Frequency Tolerance at 25oCFtol - - ±50 ppm (see Note 1) Frequency Stability Over Temp Ftemp - - ±50 ppm (see Note 1) Frequency Deviation Over Time Fage - ±3 to 5 - ppm (see Note 2) Total Allowable PPM Budget - - ±50 ppm (see Note 3) Shunt Capacitance CO --5 pF Load Capacitance CL 8- 12 pF Drive Level PW - 100 - µW (see Note 4) Equivalent Series Resistance R1 --80 Ω XTAL2 Series Resistor RS 495 500 505 Ohm Operating Temperature Range (see Note 5)- (see Note 6) oC XTAL1/CLKIN Pin Capacitance - 3 typ - pF (see Note 7) XTAL2 Pin Capacitance - 3 typ - pF (see Note 7) LAN8741 XTAL2 XTAL1 RS Y1 C1 C2 |
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